二氧化钛纳米管的合成及其表征

采用水热合成法，以TiO2粉体和NaOH为原料，成功地制备出了TiO2纳米管。用XRD，SEM，HRTEM，紫外吸收光谱分析仪和光谱辐射分析仪等手段对纳米管进行微观形貌、光学性能的表征，并探讨了其生长机理。结果表明，所得产物为锐钛矿和金红石混晶型TiO2纳米管，管壁为多层，管的外径分布在10nm～50nm，长度可达几微米甚至十几微米，呈开口状；TiO2纳米管的生长机理符合3-2-1D的生长模型，其紫外吸收光谱和光致发光光谱相对于原料粉均呈现出蓝移现象，光致发光光谱显示TiO2纳米管在可见光区的发光强度明显增强。

Synthesis and Characterization of TiO_2 Nanotube

TiO2 nanotube was synthesized successfully by hydrothermal process, using TiO2 powder and NaOH as the precurser. The micro-morphology and optical properties were characterized by XRD, SEM, HRTEM, UV Absorption Spectra Analyzer and Spectroradiometer, and the formation mechanism was also studied. The results showed that the product is anatase TiO2 nanotube with multiple layers wall, 10 nm~50 nm in the out-diameter, several micron to tens in the length, and opened in both of ends. The formation mechanism of the tube is coordinate with 3-2-1D model. The UV Absorption Spectra and PL spectra showed that the TiO2 nanotubes present blue-shift phenomenon compared to the raw material. The PL spectra also showed that at the visible band the luminous intensity of the TiO2 nanotubes increased obviously.